feat(sound): add various members to SESoundInternal and SEDiskSound

src/sound/SESoundInternal.cpp

@@ -0,0 +1,7 @@
+#include "sound/SESoundInternal.hpp"
+#include "sound/SESound.hpp"
+
+SESoundInternal::SESoundInternal() {
+    // TODO
+    this->m_uniqueID = SESound::s_UniqueID++;
+}

src/sound/SESoundInternal.hpp

@@ -1,13 +1,40 @@
 #ifndef SOUND_SE_SOUND_INTERNAL_HPP
 #define SOUND_SE_SOUND_INTERNAL_HPP
 
+#include <fmod.hpp>
+#include <cstdint>
+
+class SESound;
+class SFile;
+
 class SESoundInternal {
     public:
+        // Member variables
         // TODO
+        FMOD::System* m_fmodSystem;
+        FMOD::Channel* m_fmodChannel = nullptr;
+        SESound* m_sound = nullptr;
+        // TODO
+        int32_t m_useCache = 0;
+        int32_t m_type = 0;
+        // TODO
+        FMOD_MODE m_fmodMode = FMOD_DEFAULT;
+        // TODO
+        int32_t m_loaded = 0;
+        // TODO
+        uint32_t m_uniqueID;
+
+        // Member functions
+        SESoundInternal();
 };
 
 class SEDiskSound : public SESoundInternal {
     public:
+        // Member variables
+        // TODO
+        SFile* m_file;
+        // TODO
+        FMOD::Sound* m_fmodSound;
         // TODO
 };